MENGYuan,YUANLin-jiang,NIUYu-wei,et al.Distillation Technology for Concentration and Separation of Folic Acid Production Wastewater： Performance and Parameter Optimization[J].China Water & Wastewater,2023,39(19):109-115.
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Distillation Technology for Concentration and Separation of Folic Acid Production Wastewater： Performance and Parameter Optimization

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第19期 Page: 109-115 Column: Date of publication: 2023-10-01
Author(s):
MENG　Yuan1; 2; 3;  YUAN　Lin-jiang1; 3;  NIU　Yu-wei1; 3;  WANG　Qian1; 3;  WEI　Ping1; 3;  WANG　Ru1; 3;  YANG　Rui1; 3
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. China United Northwest Institute for Engineering Design ＆ Research Co. Ltd.， Xi’an 710077， China； 3. Key Laboratory of Northwest Water Resources， Environment and Ecology ， Xi’an 710055， China）
Keywords:
folic acid wastewater;  NH3-N;  COD;  high salinity;  vacuum distillation;  parameter optimization
Abstract:
Folic acid wastewater was concentrated and separated through distillation, and then the process parameters were optimized, the wastewater quality before and after distillation were compared, the effects of pH, temperature and pressure on the quality of the condensate were investigated, and the operational cost was analyzed. After distilling wastewater with COD of 10 386 mg/L, ammonia nitrogen of 345 mg/L and total dissolved solids (TDS) of 50 000 mg/L at atmospheric pressure and 105 ℃, the condensate with volume of approximately 95% of the raw liquid could be recovered, in which the pollutants were mainly a small amount of volatile fatty acids and ammonia nitrogen. The COD and ammonia nitrogen in the condensate were only 119 mg/L and 219 mg/L, respectively, and the TDS was less than 10 mg/L. During the evaporation process, the complex organic compounds in the folic acid wastewater were partially decomposed into volatile fatty acids and ammonia nitrogen. The pH of the wastewater was adjusted to 6.0 in advance, and then the temperature of the distillation system was reduced to 91 ℃ at 0.07 MPa. When the recovery rate was 95%, the total nitrogen and COD were reduced by 17.7% and 22.7%, respectively. The optimal distillation performance was obtained when the pH was adjusted to 4.5 after the raw water being filtered by the membrane and the pressure was 0.04 MPa without stirring. The effluent quality met the limit specified in Wastewater Quality Standards for Discharge to Municipal Sewers (GB/T 31962-2015), and the operational cost was approximately 26.85 yuan/m3.
Last Update: 2023-10-01